Arc-lamp.



PATENTED NOV. 27, 1906.

mkase n.

F. s. MURR AY.

ARC LAMP. APPLICATION FILED APR. 13. 1904.

1 producing scenic effects: for theatrical pure 1 inclosing the are, so as to reliably prevent all I i and adjusting the carbons and also in general --:pa"'rts in the several figures, Figure 1 is a ver- 35 Referring now more especially to the pari40 2 desi case and formed by the walls of the case and The plate 9 may also have pe orations,if de- .mv 'rnn STATES PATENT OFFICE.

FREDERICK-S. MURRAY, OF NEW YORK, N. Y., ASSIGNOR 'ro THE NEW YORKCALCIUM LIGHT COMPANY, or NEW YORK, N. Y., A FIRM.

ARC-LAMP. i

To all whom it may concern:

Be it known that I, FREDERICK S. MURRAY,

a citizen of the United States, and a resident of New York city, in the county and State of 5 New York, have invented a certain new and useful Arc-Lamp, of which the following isa specification.

This invention relates to arc-lamps, and

more particularly to such as are adapted for The invention seeks-to provide an inclosed lamp having suitable provision made for ventilation, while at the same time securely possibility of setting fire to surrounding obects. v

The invention also seeks to provide a convenient and simple arrangement for feeding to rovide a safe, convenient, and economiea lamp for the purpose stated.

In the, accompanying drawings, forming partpf this specification, and in which like 25 reference-numerals designate corresponding tical sectional elevation of a lamp embodying the invention. Fig. 2 is a sectional plan view on the line 2 2 of Fig. 1 looking up- 3 ward. Fig. 3 is a partial plan view of the bottom of the lamp. Fig.4 is a lan view ofa removable window-closure. ig. 5 is an under lan view of the handle attached to the car on-feed.

ticular embodiment of the invention as shown in the drawings, 1 is a case preferably made of sheet metal and having the shape of a wedge, the small end being at the rear.

gnates a frustum-shaped reflector 1 provided at the broad front portion of the a partition-wall at the top, as indicated in 45- 3 and 4 are the carbons which pass through openings in the top, being surrounded by orcelain-rings -5 and 6 or other convenient orm of insulation.

The-top of the case is provided with ven 5 tilating-holes 7 and 8. ,These holes 7 and 8 are screened by plates 9 and 10, respectively.

The plate 10 has" small perforations 11 arranged out of line with the erforations 8.

Specification of Letters'llatent. Appiication filed April13, 1904. Serial No. 202,935.

post.

Patented Nov. 27, 1906.

sired. The plates 9 and 10 at their 'side edges are detached from the top of the case, thus leaving a free air-space beneath the plates. The bottom of the'case has a series of perforations 12, screened by a plate 13, secured to the bottom of the casebeneath the perforations, there being an opening 14 left along one edge of the plate 13, so that air may enter through the openings 14 and 12.

15 and 16 are slideways to receive colored plates which may be employed to produce color effects.

At the front of the case and at the back of the reflector 2 a window is provided, into I which fits a removable closure 17, of mica,

glass, or other translucent material. The closure is held in place by flanges 18 and 19. One side of the case is provided with a door 20, designed to give access to the interior of the lamp.

r 21 is a small sight-opening covered with glass or mica, by which the operator may inspect the condition of the arc.

22 and 23 are the carbon-holders, provided,

respectively, with set-screws 24 and 25 for gripping the carbons and also provided with lugs or binding-posts 26 and 27 for securing the circuit-wires to the carbon-holders, which are diagrammatically illustrated in Fig. 1. The carbon-holders are mounted on threaded sleeves 28 and 29, being separated therefrom by insulation 30 and 31.

32 is a threaded post rotatable in blocks 33 and 34, secured to the top and bottom of the 1. case at the rear. The upper and lower portions of post 32 have reversed threads, so that when the post is rotated in one direction the carbons are brought together and when rotated in the opposite direction they are separated.

35 is a smooth post mounted in the blocks 33 and 34 at the rear of post 32 and on which slide sleeves 36 and 37, fixed to sleeves 28 and 29.

38 and 39 are a pair of twin sleeves rigidly secured together and to the back of the case and surroundin posts 32 and 35. The post 32 is unthreade circled by the sleeve 39.

40 and 41 are openings in the bottomof the case, through which the circuit-wires pass.

42 is a handle secured to the lower projecting end of the post 32 for operating the The bottom of this handle is provided at its middle, where it is enwith a loop 43, so that when the la'mp'is supported out of the reach of the operator he may engage the loop by means of a separate operating-rod to rotate-the post 32 and adjust the carbons. This loop 43 is arranged so that it may be folded down into a recess 111 the body of thehandle 42 when not required for use.

The lamp is supported ordinarily on a standard which connects with a bracket 44, secured to the bottom of the case. i

If desired, short carbons may be used which do not project through the case. Under these circumstances it is desirable to close the holes in the top and bottom of the case for the carbons. 45 and 46 are pivoted covers which may be used for this purpose.

' It will be seen that while the openings in the case providefor free'air circulation they are so arranged as to prevent any sparks from flying out of the case and so as to prevent any inflammable material entering the case from the outside. Thus all danger from conflagration arising from use of the lamp is avoided.

It will be seen that the carbon-feed, except the handle, is inclosed within the case and is thus protected from outside interference and also from damage which would otherwise be likely to arise from the somewhat rough handling of the lamp when not in use.

Of course, if desired, the screw-post of the carbon-feed may be arranged side by side or behind the smooth post, and various other changes may be made in the form and arrangement of parts without departing from the scope of the invention. For instance, the door 20 and the sight-opening 21 may be duplicated and may be located in a different position from that illustrated in the drawm s.

I claim v 1. An arc-lamp com rising a frustumshaped reflector provide at its rim with supporting-guides for screens; said reflector being closed at its rear by a partition provided with a translucent window; a wedge-shaped case in the rear of said reflector, which cooperates with said case to form a com let-e inclosure; and means for holding and eeding carbons mounted in said case to form an arc in the rear of said translucent window.

2. An arc-lamp comprising a frustumshaped reflector provided at its rim with supporting-guides for screens; said reflector being closed at its rear by a partition provided with a translucent window; a wedge-shaped case in the rear of said reflector, which co operates with said case to form a complete inclosure; said case provided at top and bottom with shielded ventilating-openings; and means for holding and feeding carbons mounted in said case to form an arc in the rear of said translucent window.

3. An arc-lamp comprising awedge-shaped closed case; means for holding and feeding carbons to maintain an arc, said means iiiclosed by the case; an insulating-bushing fixed to the top and bottom of the case respectively with its opening in alinement with an opening in the case to permit a carbon to protrude; a frustum-shaped reflector "provided at the broad front of the case; said reflector comprising a wall of said wedgeshaped case and also closed at its rear by one '7 5 wall of said wedge-shaped case, which wall is prism a wall of said wedge-shaped case and also 0 osed at its rear by one wall of said Wedge-shaped case, .which wall is provided with a translucent window; and said reflector rovided at its run with supportingguides or screens.

5. An arc-lamp comprising awedgeslia ed closed case; means for holding and fee ing carbons to maintain an are; said means inclosed by the case; an insulatingbusln'ng fixed to the top and bottom of the case respectively with its opening in alinement with an opening in the case to permit a carbonto protrude; a closable shutter for each 0 ening attached to the to and bottom of t e case; a frustum-shape reflector comprisin a wall of said wedge-shaped case and also 0 osed at its rear by one wall of said Wedge-shaped case, which wall is provided with a translucent window; and said reflector provided at its rim with supportingguides for screens.

6. An arc-lamp comprising a wedgeshaped closed case provided at the top and bottom with shielded ventilating-openings; means for holding and feeding carbons to maintain an are, said means inclosed by the case; an insulating-bushing fixed to the top and bottom of the case respectively with its opening in alinement with an opening in the case to permit a carbon to rotrude; a frustum-shaped reflector rovi ed at the broad front of the case; said reflector comprisin a wall of said wedge-shaped case and a so closed at its rear by one wall of said wedgeshaped case, which wall is provided with a translucent window; and said reflector provided at its rim with supporting-guides for screens.

7. An arc-lamp comprising a wedgeshaped closed case provided at the top and bottom with shielded ventilatingopenings; means for holding and feeding carbons to maintain an arc, said means inclosed by the case and mounted on the rear wall of the case; an operating-handle for said means projecting through the bottom of the case a irustum-shaped reflector provided at the broad front of the case; said reflector comprising a wall of said wedge-shaped case and also closed at its rear by one wall of said wedge-shaped case, which wall is provided with a translucent window; and said reflector provided at its rim with supportingguides for screens.

8. An arc-lamp com rising a wedgeshaped closed case provided at the top and bottom with shielded ventilatingopenings; means for holding and feeding carbons to maintain an arc, said means inclosed by the case and mounted on the rear wall of the case; an operating-handle for said means projecting through the bottom of the case; an insulating-bushing fixed to the top and bottom of the case respectively with its opening in alinement with an opening in the case to permit a carbon to protrude; a frustumshaped reflector provided at the broad front of the case; said reflector comprisin a wall of said wedge-shaped case and also c osed at its rear by one wall of said wedge-shaped case, which wall is provided with a translucent window; and said reflector provided at i its rim with supporting-guides for screens.

9. An arc-lamp comprising a wedge- 30 shaped closed case; rovided at the top and bottom with shielded ventilatingopenings; means for holding and feeding carbons to maintain an arc, said means inc'losed by the case and mounted on the rear wall of the case; an operating-handle for said means projecting through the bottom of the case; an insulating-bushing fixed to the top and bottom of the case respectively with its opening in alinement with an opening in the case to permit a carbon to protrude; a closable shutter for each opening attached to the top and bottom of the case; a frustum-shape reflector provided at the broad front of the case; said reflector comprising a wallof said wedge-shaped case and also :closed at its rear by one wall of said wedge-shaped case, which wall is provided with a translucent window and said reflector fprovided at its rim with supporting-guides or screens.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK S. MURRAY.

Witnesses:

NICHOLAS M. GooDLET r, Jr., ELI J. BLAIR. 

